[OSM-talk] [tech/API] Accessing tags set by a user for traces

[Robert (Jamie) Munro]

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Tom Hughes wrote:
> Guilhem Bonnefille wrote:
> 
>> I'm working on Viking[1], a GPS desktop application with OSM related features.
>>
>> In order to assist user when uploading its traces to OSM, I wish to
>> contact OSM, retrieve the previously used tags, and propose these tags
>> to the user for the new trace.
>>
>> Is there such API actually?
> 
> No, and I don't think one would be practical. To start with we don't 
> currently normalise the tags at all so there is lots of duplication in 
> the tag table - the only way to get a list of tags is to select distinct 
> on the tag column.
> 
> Scale wise we have about 250,000 tag records currently, and even if you 
> remove the duplicates there are about 40,000 or so. I don't think people 
> are going to want to download 40,000 tags even if we wanted to let them.

Any chance of a report of the most popular tags, or would it lock up the
database for ages just to query them?

Robert (Jamie) Munro

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